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75乘以74分之47简便方法

73*74/75=(75-2)(75-1)/75=[75^2-3*75+2]/75=75-3+2/75=72+2/75

解:原式=74*(1-1/75)=74*1-74*(1/75)=74-74/75=73又1/75

75*(73/74) =75*(1-1/74) =75-75/74 =73+73/74.. 73又74分之73.

73/75 x 74 =73/75 x(75-1) =73-73/75 =72又2/75

75*7/74=(74+1)*7/74=74*7/74+1*7/74=7+7/74=7又7/74

(76+1)*75/76=76*(75/76)+1*(75/76)=75+75/76

3.8*百分之75加42*4分之三用简便方法计算3.8*75%+42*3/4=3.8*3/4+42*3/4=(3.8+42)*3/4=34.35

75*73/74=(74+1)*73/74=74*73/74+1*73/74=73又73/74 回答完毕~~ 有疑问请追问,无疑问请点击【采纳】~ 祝学习进步~~~\(^o^)/~

75*5/74=(74+1) * 5/74=74*5/74+1*5/74=5又5/74

=(74+1)*(3/74)+71/74=74*(3/74)+3/74+71/74=3+1=4

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